A New Polyphenol Oxidase Test.

By cultivation on a red cabbage medium wood-rotting fungi are easily classified into those which produce polyphenol oxidase and those which do not, Polyphenol oxidase producing species change the original purple colour of the medium into yellow; the other species of wood-rotting fungi change the colour into red, A quick method for the differentiation of these two groups is described. The reaction of these fungi to red cabbage extract is more suitable for separating them than Bavendamm's polyphenol oxidase test. [ABSTRACT FROM AUTHOR]